This introduces a Kconfig option for ACPI S3 resume, as well as a header file to include anything related to ACPI S3 resume.
Signed-off-by: Bin Meng bmeng.cn@gmail.com ---
arch/x86/Kconfig | 12 +++++++++ arch/x86/include/asm/acpi_s3.h | 58 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 70 insertions(+) create mode 100644 arch/x86/include/asm/acpi_s3.h
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index dfdd756..7ea9148 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -571,6 +571,18 @@ config GENERATE_ACPI_TABLE
endmenu
+config HAVE_ACPI_RESUME + bool "Enable ACPI S3 resume" + help + Select this to enable ACPI S3 resume. S3 is an ACPI defined sleeping + state where all system context is lost except system memory. U-Boot + is responsible for restore the machine state as it is before sleep. + It needs restore the memory controller, not overwriting memory which + is not marked as reserved. For the peripherals which lose their + registers, U-Boot needs to write the original value. When everything + is done, U-Boot needs to find out the wakeup vector provided by OSes + and jump there. + config MAX_PIRQ_LINKS int default 8 diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h new file mode 100644 index 0000000..6fbfc3e --- /dev/null +++ b/arch/x86/include/asm/acpi_s3.h @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2017, Bin Meng bmeng.cn@gmail.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __ASM_ACPI_S3_H__ +#define __ASM_ACPI_S3_H__ + +/* PM1_STATUS register */ +#define WAK_STS (1 << 15) +#define PCIEXPWAK_STS (1 << 14) +#define RTC_STS (1 << 10) +#define SLPBTN_STS (1 << 9) +#define PWRBTN_STS (1 << 8) +#define GBL_STS (1 << 5) +#define BM_STS (1 << 4) +#define TMR_STS (1 << 0) + +/* PM1_CNT register */ +#define SLP_EN (1 << 13) +#define SLP_TYP_SHIFT 10 +#define SLP_TYP (7 << SLP_TYP_SHIFT) +#define SLP_TYP_S0 0 +#define SLP_TYP_S1 1 +#define SLP_TYP_S3 5 +#define SLP_TYP_S4 6 +#define SLP_TYP_S5 7 + +enum acpi_sleep_state { + ACPI_S0, + ACPI_S1, + ACPI_S2, + ACPI_S3, + ACPI_S4, + ACPI_S5, +}; + +/* Given the provided PM1 control register return the ACPI sleep type */ +static inline enum acpi_sleep_state acpi_sleep_from_pm1(u32 pm1_cnt) +{ + switch ((pm1_cnt & SLP_TYP) >> SLP_TYP_SHIFT) { + case SLP_TYP_S0: + return ACPI_S0; + case SLP_TYP_S1: + return ACPI_S1; + case SLP_TYP_S3: + return ACPI_S3; + case SLP_TYP_S4: + return ACPI_S4; + case SLP_TYP_S5: + return ACPI_S5; + } + + return -1; +} + +#endif /* __ASM_ACPI_S3_H__ */